Welding Processes. Consumable Electrode. Non-Consumable Electrode. High Energy Beam. Fusion Welding Processes. SMAW Shielded Metal Arc Welding
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1 Fusion Consumable Electrode SMAW Shielded Metal Arc Welding GMAW Gas Metal Arc Welding SAW Submerged Arc Welding Non-Consumable Electrode GTAW Gas Tungsten Arc Welding PAW Plasma Arc Welding High Energy Beam Electron Beam Welding Laser Beam Welding
2 SMAW Shielded Metal Arc Welding Consumable electrode Flux coated rod Flux produces protective gas around weld pool Slag keeps oxygen off weld bead during cooling General purpose welding widely used Thicknesses 1/8 3/4 Portable Power... Current I ( amps) Voltage V (15-45 volts) Power = VI 10 kw
3 Electric Arc Welding -- Polarity SMAW - DC Polarity Straight Polarity ( ) Reverse Polarity (+) (+) ( ) Shallow penetration (thin metal) Deeper weld penetration AC - Gives pulsing arc - used for welding thick sections
4 GMAW Gas Metal Arc Welding (MIG) DC reverse polarity - hottest arc AC - unstable arc MIG - Metal Inert Gas Gas Metal Arc Welding (GMAW) Torch Consumable wire electrode Shielding provided by gas Double productivity of SMAW Easily automated Groover, M., Fundamentals of Modern Manufacturing,, p. 734, 1996
5 SAW Submerged Arc Welding amps (440 V) Consumable wire electrode Shielding provided by flux granules Gas Metal Arc Welding (GMAW) Torch Low UV radiation & fumes Flux acts as thermal insulator Automated process (limited to flats) High speed & quality (4 10x SMAW) Suitable for thick plates
6 GTAW Gas Tungsten Arc Welding (TIG) Current I (200 A DC) (500 A AC) Power 8-20 kw a.k.a. TIG - Tungsten Inert Gas Non-consumable electrode With or without filler metal Shield gas usually argon Used for thin sections of Al, Mg, Ti. Most expensive, highest quality
7 Laser Welding Laser beam produced by a CO2 or YAG Laser High penetration, high-speed process Concentrated heat = low distortion Laser can be shaped/focused & pulsed on/off Typically automated & high speed (up to 250 fpm) Workpieces up to 1 thick Typical laser welding applications : Catheters & Other Medical Devices Small Parts and Components Fine Wires Jewelry Small Sensors Thin Sheet Materials Down To 0.001" Thick
8 Solid State Friction Welding Diffusion Welding Ultrasonic Welding Resistance Welding
9 Friction Welding (Inertia Welding) One part rotated, one stationary Stationary part forced against rotating part Friction converts kinetic energy to thermal energy Metal at interface melts and is joined When sufficiently hot, rotation is stopped & axial force increased
10 Resistance Welding Resistance Welding is the coordinated application of electric current and mechanical pressure in the proper magnitudes and for a precise period of time to create a coalescent bond between two base metals. Heat provided by resistance to electrical current (Q=I 2 Rt) Typical V but up to 100,000 amps! Force applied by pneumatic cylinder Often fully or partially automated - Spot welding - Seam welding
11 Resistance Welding Resistance Welding is the coordinated application of electric current and mechanical pressure in the proper magnitudes and for a precise period of time to create a coalescent bond between two base metals. Heat provided by resistance to electrical current (Q=I 2 Rt) Typical V but up to 100,000 amps! Force applied by pneumatic cylinder Often fully or partially automated - Spot welding - Seam welding
12 Diffusion Welding Parts forced together at high temperature (< 0.5Tm absolute) and pressure Heated in furnace or by resistance heating Atoms diffuse across interface After sufficient time the interface disappears Good for dissimilar metals Bond can be weakened by surface impurities Kalpakjian, S., Manufacturing Engineering & Technology, p. 889, 1992
13 Soldering & Brazing Metal Joining Processes Soldering & Brazing Only filler metal is melted, not base metal Lower temperatures than welding Filler metal distributed by capillary action Metallurgical bond formed between filler & base metals Strength of joint typically stronger than filler metal itself weaker than base metal gap at joint important ( ) Pros & Cons Can join dissimilar metals Less heat - can join thinner sections (relative to welding) Excessive heat during service can weaken joint
14 Soldering Metal Joining Processes Soldering Solder = Filler metal Alloys of Tin (silver, bismuth, lead) Melt point typically below 840 F Flux used to clean joint & prevent oxidation separate or in core of wire (rosin-core) Tinning = pre-coating with thin layer of solder Applications: Printed Circuit Board (PCB) manufacture Pipe joining (copper pipe) Jewelry manufacture Typically non-load bearing Easy to solder: copper, silver, gold Difficult to solder: aluminum, stainless steels (can pre-plate difficult to solder metals to aid process)
15 PCB Soldering Metal Joining Processes Manual PCB Soldering PTH - Pin-Through-Hole connectors Soldering Iron & Solder Wire Heating lead & placing solder Heat for 2-3 sec. & place wire opposite iron Trim excess lead
16 PCB Reflow Soldering Metal Joining Processes Automated Reflow Soldering SMT = Surface Mount Technology Solder/Flux paste mixture applied to PCB using screen print or similar transfer method Solder Paste serves the following functions: supply solder material to the soldering spot, hold the components in place prior to soldering, clean the solder lands and component leads prevent further oxidation of the solder lands. Printed solder paste on a printed circuit board (PCB) PCB assembly then heated in Reflow oven to melt solder and secure connection
17 Brazing Metal Joining Processes Brazing Use of low melt point filler metal to fill thin gap between mating surfaces to be joined utilizing capillary action Filler metals include Al, Mg & Cu alloys (melt point typically above 840 F) Flux also used Types of brazing classified by heating method: Torch, Furnace, Resistance Applications: Automotive - joining tubes Pipe/Tubing joining (HVAC) Electrical equipment - joining wires Jewelry Making Joint can possess significant strength
18 Brazing Metal Joining Processes Brazing Use of low melt point filler metal to fill thin gap between mating surfaces to be joined utilizing capillary action Filler metals include Al, Mg & Cu alloys (melt point typically above 840 F) Flux also used Types of brazing classified by heating method: Torch, Furnace, Resistance Applications: Automotive - joining tubes Pipe/Tubing joining (HVAC) Electrical equipment - joining wires Jewelry Making Joint can possess significant strength
19 Brazing Metal Joining Processes Brazing Figuring length of lap for flat joints. X = Length of lap T = Tensile strength of weakest member W = Thickness of weakest member C = Joint integrity factor of.8 L = Shear strength of brazed filler metal Problem: Let s see how What this length formula of lap works, do you using need an to example. join.050" annealed Monel sheet to a metal of equal or greater strength? Solution: C =.8 T = 70,000 psi (annealed Monel sheet) W =.050" L = 25,000 psi (Typical shear strength for silver brazing filler metals) X = (70,000 x.050) /(.8 x 25,000) =.18" lap length
20 Soldering & Brazing Metal Joining Processes Brazing Figuring length of lap for tubular joints. X = Length of lap area W = Wall thickness of weakest member D = Diameter of lap area T = Tensile strength of weakest member C = Joint integrity factor of.8 Again, an example will serve to illustrate the use of this formula. Problem: What length of lap do you need to join 3/4" O.D. copper tubing (wall thickness.064") to 3/4" I.D. steel tubing? Solution: L = Shear strength of brazed filler metal W =.064" D =.750" C=.8 T = 33,000 psi (annealed copper) L = 25,000 psi (a typical value) X = (.064 x ( ) x 33,000)/(.8 x.75 x 25,000) X =.097" (length of lap)
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